I don't think it's really necessary. After all, it's not done with any of the other Toys to Life figures, and none of them have the names on the figures either.
Also, the games themselves tell you what the character is, including any additional suffixes, when used ingame (They just don't recognize a chase variant, like the Gold/Silver figures). And there are checklists both packaged with the game and via an ingame menu. The model numbers are also not fully unique/non-unique to the molds either. For example:
1) Both the Spyro and Dark Spyro from the Adventures line use the same mold but do not have the same model number
2) Ninjini and Scarlet Ninjini from Giants share a mold and have the same model number, despite being completely separate items rather than a chase variant
3) Boomer from Adventures and Boomer from the Eon's Elite collection do not have the same mold, but do have the same model number.
If you're having difficulty telling what skylander is what, an easy way to narrow it down to the series is by looking at the base:
Adventures: Green
Giants: Orange
Swap Force: Blue
Trap Team: Red
Eon's Elite: White
Superchargers: Vehicle engine instead of colored base
Imaginators: Rectangular octagon instead of colored base